feat(standards): add Drone CI standard (PyPI package + Docker deployment)

Document the two `.drone.yml` shapes used across the org, derived from the
repos:

- Type A `python-lib.yaml`: build-and-publish-pypi + backfill-pypi-from-tags
- Type B `service-docker.yaml`: build-and-deploy-service + build-and-deploy-site

- add reference page `10_drone_pipelines`
- vendor `src/templates/drone/` into the MCP bundle (`drone.json`)
- expose `registry://drone` + `list_drone_templates` / `get_drone_template`
- wire `build.py` to vendor drone templates; rebuild nav/index (14 modules)

standards/mcp/drone.json

@@ -0,0 +1,22 @@
+{
+  "project": "standards",
+  "template": "templates/drone",
+  "types": [
+    "pypi",
+    "docker"
+  ],
+  "components": [
+    {
+      "kind": "drone-pypi",
+      "path": "python-lib.yaml",
+      "placeholder": "",
+      "description": "Drone pipeline: build + publish a Python package to the private PyPI index."
+    },
+    {
+      "kind": "drone-service",
+      "path": "service-docker.yaml",
+      "placeholder": "",
+      "description": "Drone pipeline: build, push, and deploy a Docker service or site."
+    }
+  ]
+}